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|English to English translations [PRO]|
Tech/Engineering - Electronics / Elect Eng
|English term or phrase: pass through (meaning of sentence)|
|sensors - safety applications - muting function|
this is the sentence:
"***Only one of these sources may pass through***, or be affected by, a programmable logic controller (PLC) or similar device.
General Muting Device Requirements
The muting devices (typically sensors or switches) must, at a minimum, comply with the following requirements:
There must be a minimum of two independent hard-wired muting devices.
The muting devices must either both have normally open contacts; or one device with a PNP output and one device with a NPN output, both of which must fulfil the input requirements listed in Table 2.
These contacts must close when the switch is operated, and must open (or not conduct) when the switch is not operated or in a power OFF condition.
The activation of the inputs to the muting function must be from separate sources.
These sources must be mounted separately in order to prevent an unsafe muting condition resulting from maladjustment, misalignment, or a single common mode failure. (For example: physical damage to the mounting surface could cause both muting devices to be knocked out of alignment, resulting in false muting input signals.)
***Only one of these sources may pass through***, or be affected by, a programmable logic controller (PLC) or similar device. The muting devices must be installed so that they can not be easily defeated or bypassed. The muting devices must be mounted so that their physical position and alignment can not be easily changed.
...does it mean, only one of these sources (power sources?) may be connected to a PLC or similar device....??
|English translation:See explanation...|
No! From the limited context available, I would interpret this as meaning that the 'sources' are not POWER sources, but sources of some kind of alarm signal. So it is in fact just ONE of these 'SIGNALs' coming from the various sources that is selected and allowed to pass through --- think of it like a big switch choosing between different inputs!
In fact, since these seem to be some restrictive conditions applied for security/safety reasons, it would probably be more accurate to view it like this:
"Not more than one of these sources may be routed via a PLC [etc.]..." --- since passing these signals through such an ancillary device could conceivably introduce a higher risk of breakdowns or errors.
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Local time: 19:32
|thanks Dusty and thanks also to Edward, this was difficult to grade as aswers are both clear and correct|
4 KudoZ points were awarded for this answer